I was using the frame of the dock for locating the posts initially I tried the red 0 degree nozzle but lost it after the quick connect unlocked while moving it up/down under a post. Turned out the yellow 15 degree nozzle worked better. I set the post upright used a piece of string to tie it off to the frame plumbed. Just worked the jet around the post in the perpendicular plane then slowly undermine the bottom material. I made use of a fire brick block that was laying in some old materials dumped for seawall erosion. Set it on top because the posts wanted to float after going down a couple feet. I grabbed a bunch of bags of pea stone from the local Ace and poured them around the posts and over time the mud and sediment should lock them in.
